Fixed BUG#17476: Stored procedure not returning data when it is called first
time per connection Removed const_string() method from Item_string (it was only used in one place, in a bad way). Defer possible SP variable, and access data directly instead, in date_format item. mysql-test/r/sp.result: Updated results for new test (BUG#17476). mysql-test/t/sp.test: New test case (BUG#17476) sql/item.h: Removed const_string() from Item_string. It was only used in one place, and we can just use str_value in Item directly. sql/item_timefunc.cc: Must defer a (possible) local SP variable to use max_length and str_value in Item_func_date_format::fix_length_and_dec(), and refer to str_value directly without the const_string() method (now removed); the cast didn't work in all cases anyway.
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